Process of clarifying chlorinated solutions



. Patented Nov 13,1934

1,930,896 4 j rnocass or cmmrmc cnnonma'mn" SOLUTIONS Clifton N.Windecker, Painesville, Ohio No Drawing. Application July 7, 1932, 4

Serial No. 621,312

r 4 Claims. (01. 21o--2) When chlorine is used to form. and sterilizetrated'sludge which, when recirculated-and added sludges and putridmatter, in'sewage or other to the raw sewage, acts as a coagulating andwastes, and these .sludges are-removed, a fine sterilizing medium toremove all settlable solid cloud remains in the main sewage efiluent.'Itproducts. The action ofchlorine inthis process 6 not settle andcannot be coagulated or ,-filproduces a finely dispersed sterilizedcloud which tered by known methods without great expense.- can be, withsafety to health, carried into any The object of this invention is tocoagulateand stream or body of water if clarity of discharge is renderthis cloud either settlable or filterablea not necessary. When clarityof discharge is re- Todo this cheaply and efficiently, I have disquired,this invention produces conditionsthat 10 covered-that a flocculentprecipitate must be prowill render the cloud settlable or,,fi1terable"to any duced to properly coagulate this cloud. This desired clarity, Ido not wish to limit myself, fiocculentprecipitate may be formed by.precipihowever, to the use of thisinvention in connectating the calciumbicarbonate, calcium sulphate, tion with the Lyon process. but intendits use with and magnesium compounds found in all natural other sewagetreatment in which chlorine is used.

15 waters to a varying degreaf'lhere are many Should 'it be desired touse a lesser amount of chemicals which will precipitate these minerals,chlorine in the treatme'ntof sludges than will be. among which are thehydroxides of sodium, porequired. to completely sterilize the sewageeillutassium, magnesium, calcium, barium, etc., the ent, furtherchlorine may be added after clarity cheapest of which is calciumhydroxide, and this has been obtained by this process without. pro- 20 Iprefer to use, although acombination of two ducing a cloudy efiect I ormore of them, including calcium hydroxide, In localities where householdwastes and.varymay be employed. I a ing composition of trade'wastea'suchas pickling.

' The use of calcium hydroxide or-lime is not acid wastes, etc., arepresent at various times, new, for removing temporary hardness fromnatvery simple chemicaltests-canbe made by'whicl'i' 25 ural waters,'butin removing the cloud formed by. the amounts of lime orother necessaryreagents chlorinating sewage a conditionexists which difcan bedetermined to accomplish the desired fers from that foundintreatingnatural waters to results. a remove temporary hardness. Thiscondition is The treatment of the cloudy chlorinated solu- Pro by theaction of chlorine 0n h varition with lime, together with one or more ofthe 30 ous substancesinsewage, re i in he produc other reagentsmentioned, is preferably carried tion of acids and acid products. out inan agitating tank after the sewage. has These acids a d acid P od t togh wi been treated with chlorine and the heavy sludges any desired amountof 'free chlorine, must ,be removed. Insome instances, however, thechlorineutralized before any'fiocculent precipitate can nation ofthesewage and the treatment-with 5 be iormed. In y g out the presentinvenlime may be efiected simultaneously or substantio su t e equivalentmaterial s tially so, but in most instances the two treatments added tothe cloudy chlorinated fiiuent to new are carried out separately,especiallyas the agitralize the free 0 av i a o e and the tationnecessary for chlorination and removal of acids and acid productsreferred to, together with th he vi r sludges may disturb the fiocculent1 40 enough. lime to throw down a pr ipi a e character of theprecipitate necessary for comenough fiocculent material to coagulate thefine plete clarification, v cloudand render it settlable or filterableto any v Having th described my invention, I laim;

I desired elarityi The s re111t$ are Obtained 1. The process of sewagedisposal, which comwhen the maximum amount of precipitation is prisestreating sewage-with chlorine and remov- 45 formed. If the naturalwaters are so pure as not in solids, and subsequently treating theseparat- 10b to furnish the p op r amount of fieeeuletihg ed efliuent byneutralizing acid products therein terie additions mayb made of Suchaterials and producing a flocculent precipitate entrainas will prod c aufl fl such as u ing finely divided' suspended particles. ferricchloride, or other well known coagulants. 2. The process of sewagedisposal, which. com- 50 This invention will be of special advantage inprises treating sewage with chlorine and removconnection with an invenion descri d in appliing solids, and subsequentlytreating the cloudycation for Letters Patent of the Unitedstates eflluent produced by thechlorinated products Serial No. 611,549, filed May 16, 1932 in the namewith calcium hydroxide in amount to neutralize of Charles E. Lyon. TheLyon invention uses the acid and producing afiocculent precipitate en-55 proper amount of chlorine tochlorinate a concentraining finelydivided suspended particles,

- 3. The process of sewage disposal which comprises treating sewagesludges with chlorine, introducing the chlorinated sludges into rawsewage thereby removing the heavy sludges by settlement, and treatingthe efliuent with one or more substances. which neutralize the acids andacid products produced by the chlorination step and throw down aflocculent precipitate to coagulate the finely divided particles insuspension.

4. The process of sewage disposal which com-

